Projection optical assembly with multiple refractive optical systems and related projector device

A projection optical system that projects from a first image plane on a reducing side to a second image plane on an enlargement side, comprising:

• a first optical system including a first refractive optical system and a second refractive optical system, the first refractive optical system including a plurality of lenses and forms light incident from the reducing side into a first intermediate image on the enlargement side, the second refractive optical system including a plurality of lenses and forms the first intermediate image on the reducing side into a second intermediate image on the enlargement side;
• a first reflective optical system that includes a first reflective surface with positive refractive power that is positioned closer to the enlargement side than the second intermediate image;
• a first stop disposed between the first image plane and the first intermediate image;
• and
• a second stop disposed between the first intermediate image and the second intermediate image, and
• wherein an optical distance EXP between an exit pupil and the first reflective surface when the first stop is a stop of the first optical system and an optical distance dw between the first image plane and the first reflective surface satisfy the following condition
• 0.1<EXP/dw<0.6.